The script for "Attack of The Hawkmen" credits "Story by George Lucas."
Many people have concluded that George Lucas' Star Wars" films and stories evolved from his early passion for WWI aviation history. He is Still quite the WWI aero buff. First draft for this script was November 1992. If you listen closely, you might notice that the engine sounds are recordings of actual WWI aero engines dubbed in. And I believe that where model aircraft were used, they slowed the footage down to approximate actual full scale speed.
They went to the trouble of drafting large size blueprints ( in the odd scale of 1:20 ) of each of the aircraft to be used in this film; the Albatros D.V; Fokker Dr.I; Nieuport 17; and Sopwith 1 1/2 Strutter. The story boards are WAY cool!